From b140b51ebbc277fa558accc33f3e99da2b9657b3 Mon Sep 17 00:00:00 2001
From: James Almer <jamrial@gmail.com>
Date: Fri, 22 Aug 2014 23:39:57 -0300
Subject: lavc/tiff: add support for LZMA compression

Derived from deflate code.
Requires liblzma.

Signed-off-by: James Almer <jamrial@gmail.com>
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
---
 libavcodec/tiff.c | 85 +++++++++++++++++++++++++++++++++++++++++++++++++++++--
 1 file changed, 83 insertions(+), 2 deletions(-)

(limited to 'libavcodec/tiff.c')

diff --git a/libavcodec/tiff.c b/libavcodec/tiff.c
index 2bb7c906c4..613ad3d9e0 100644
--- a/libavcodec/tiff.c
+++ b/libavcodec/tiff.c
@@ -28,6 +28,9 @@
 #if CONFIG_ZLIB
 #include <zlib.h>
 #endif
+#if CONFIG_LZMA
+#include <lzma.h>
+#endif
 
 #include "libavutil/attributes.h"
 #include "libavutil/avstring.h"
@@ -378,6 +381,70 @@ static int tiff_unpack_zlib(TiffContext *s, AVFrame *p, uint8_t *dst, int stride
 }
 #endif
 
+#if CONFIG_LZMA
+static int tiff_uncompress_lzma(uint8_t *dst, uint64_t *len, const uint8_t *src,
+                                int size)
+{
+    lzma_stream stream = LZMA_STREAM_INIT;
+    lzma_ret ret;
+
+    stream.next_in   = (uint8_t *)src;
+    stream.avail_in  = size;
+    stream.next_out  = dst;
+    stream.avail_out = *len;
+    ret              = lzma_stream_decoder(&stream, UINT64_MAX, 0);
+    if (ret != LZMA_OK) {
+        av_log(NULL, AV_LOG_ERROR, "LZMA init error: %d\n", ret);
+        return ret;
+    }
+    ret = lzma_code(&stream, LZMA_RUN);
+    lzma_end(&stream);
+    *len = stream.total_out;
+    return ret == LZMA_STREAM_END ? LZMA_OK : ret;
+}
+
+static int tiff_unpack_lzma(TiffContext *s, AVFrame *p, uint8_t *dst, int stride,
+                            const uint8_t *src, int size, int width, int lines,
+                            int strip_start, int is_yuv)
+{
+    uint64_t outlen = width * lines;
+    int ret, line;
+    uint8_t *buf = av_malloc(outlen);
+    if (!buf)
+        return AVERROR(ENOMEM);
+    if (s->fill_order) {
+        if ((ret = deinvert_buffer(s, src, size)) < 0) {
+            av_free(buf);
+            return ret;
+        }
+        src = s->deinvert_buf;
+    }
+    ret = tiff_uncompress_lzma(buf, &outlen, src, size);
+    if (ret != LZMA_OK) {
+        av_log(s->avctx, AV_LOG_ERROR,
+               "Uncompressing failed (%"PRIu64" of %"PRIu64") with error %d\n", outlen,
+               (uint64_t)width * lines, ret);
+        av_free(buf);
+        return AVERROR_UNKNOWN;
+    }
+    src = buf;
+    for (line = 0; line < lines; line++) {
+        if (s->bpp < 8 && s->avctx->pix_fmt == AV_PIX_FMT_PAL8) {
+            horizontal_fill(s->bpp, dst, 1, src, 0, width, 0);
+        } else {
+            memcpy(dst, src, width);
+        }
+        if (is_yuv) {
+            unpack_yuv(s, p, dst, strip_start + line);
+            line += s->subsampling[1] - 1;
+        }
+        dst += stride;
+        src += width;
+    }
+    av_free(buf);
+    return 0;
+}
+#endif
 
 static int tiff_unpack_fax(TiffContext *s, uint8_t *dst, int stride,
                            const uint8_t *src, int size, int width, int lines)
@@ -455,6 +522,16 @@ static int tiff_unpack_strip(TiffContext *s, AVFrame *p, uint8_t *dst, int strid
                "zlib support not enabled, "
                "deflate compression not supported\n");
         return AVERROR(ENOSYS);
+#endif
+    }
+    if (s->compr == TIFF_LZMA) {
+#if CONFIG_LZMA
+        return tiff_unpack_lzma(s, p, dst, stride, src, size, width, lines,
+                                strip_start, is_yuv);
+#else
+        av_log(s->avctx, AV_LOG_ERROR,
+               "LZMA support not enabled\n");
+        return AVERROR(ENOSYS);
 #endif
     }
     if (s->compr == TIFF_LZW) {
@@ -783,8 +860,12 @@ static int tiff_decode_tag(TiffContext *s, AVFrame *frame)
             avpriv_report_missing_feature(s->avctx, "JPEG compression");
             return AVERROR_PATCHWELCOME;
         case TIFF_LZMA:
-            avpriv_report_missing_feature(s->avctx, "LZMA compression");
-            return AVERROR_PATCHWELCOME;
+#if CONFIG_LZMA
+            break;
+#else
+            av_log(s->avctx, AV_LOG_ERROR, "LZMA not compiled in\n");
+            return AVERROR(ENOSYS);
+#endif
         default:
             av_log(s->avctx, AV_LOG_ERROR, "Unknown compression method %i\n",
                    s->compr);
-- 
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